Tempest Output

Failed to import test module: tempest.scenario.test_volume_boot_pattern
Traceback (most recent call last):
  File "/root/tempest/.venv/lib/python2.7/site-packages/unittest2/loader.py", line 456, in _find_test_path
    module = self._get_module_from_name(name)
  File "/root/tempest/.venv/lib/python2.7/site-packages/unittest2/loader.py", line 395, in _get_module_from_name
    __import__(name)
  File "/root/tempest/tempest/scenario/test_volume_boot_pattern.py", line 16, in <module>
    from tempest.scenario import manager
  File "/root/tempest/tempest/scenario/manager.py", line 26, in <module>
    from tempest.common.utils.linux import remote_client
  File "/root/tempest/tempest/common/utils/linux/remote_client.py", line 29, in <module>
    class RemoteClient(object):
  File "/root/tempest/tempest/common/utils/linux/remote_client.py", line 85, in RemoteClient
    def ping_host(self, host, count=CONF.validation.ping_count,
  File "/root/tempest/tempest/config.py", line 1370, in __getattr__
    self._config = TempestConfigPrivate(config_path=self._path)
  File "/root/tempest/tempest/config.py", line 1329, in __init__
    logging.register_options(_CONF)
  File "/root/tempest/.venv/lib/python2.7/site-packages/oslo_log/log.py", line 231, in register_options
    conf.register_cli_opts(_options.common_cli_opts)
  File "/root/tempest/.venv/lib/python2.7/site-packages/oslo_config/cfg.py", line 2106, in __inner
    result = f(self, *args, **kwargs)
  File "/root/tempest/.venv/lib/python2.7/site-packages/oslo_config/cfg.py", line 2290, in register_cli_opts
    self.register_cli_opt(opt, group, clear_cache=False)
  File "/root/tempest/.venv/lib/python2.7/site-packages/oslo_config/cfg.py", line 2110, in __inner
    return f(self, *args, **kwargs)
  File "/root/tempest/.venv/lib/python2.7/site-packages/oslo_config/cfg.py", line 2282, in register_cli_opt
    raise ArgsAlreadyParsedError("cannot register CLI option")
ArgsAlreadyParsedError: arguments already parsed: cannot register CLI option